Police: Dr. Conrad Murray Gave Michael Jackson Propofol, Then Left Him Unattended

Dr. Conrad Murray has been under wide scrutiny ever since Michael Jackson died June 25. The police and DEA investigation into the star's personal physician has centered around his use of Propofol, a hospital-grade anesthesia.

While that drug is believed to have killed the King of Pop on that day, sources close to the manslaughter investigation of Murray tell the Los Angeles Times that he may be charged with negligence. As in Murray essentially dosed-and-dashed.

One theory the police are working on? That Murray left the star completely alone after administering the fatal, final injection of Propofol. This is why they think there is just a gap between Jackson's time of death and the first 911 call.

Dr. Conrad Murray reportedly left Jackson in his bed in order to make phone calls and, when he returned, discovered the star was no longer breathing.

It's unclear how long the doctor was out of the room, though Murray told detectives he frequently left Michael alone and it had never been a problem.

Well, except for that last time.

Dr. Conrad Murray was the last person to see Michael Jackson alive.

Investigators are now trying to determine whether to slap negligence onto their existing manslaughter investigation, not only for leaving Michael Jackson alone that morning but for administering Propofol outside of a hospital in general.

Other drugs were found in Jackson's system at the time of his death, making it more difficult, potentially, to find Murray definitively guilty of manslaughter.

A law enforcement source also says that Jackson used Propofol for insomnia for nearly a decade, while Murray only came on as the singer's doctor this year.

Murray apparently told police he administered the drug in the early hours of June 25, after Jackson returned home from a rehearsal and could not sleep.

Murray's lawyer, Ed Chernoff, verified at least part of the sources' claims, confirming to the Times that his client did in fact chat with family members and employees in his medical offices prior to discovering Jackson's lifeless body.

As it is, while he's been netting all the headlines, Conrad Murray is one of five doctors the LAPD is investigating in connection to Jackson's death.

He is, however, the only one who has been publicly identified as a suspect.